[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h

Index: third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h b/third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h
index b069081eb0ce09087255274aabf5d41723270241..f87c0ebdc7e6ae0591e7147f00b8f9f9485daea6 100644
--- a/third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/FormatBlockCommand.h
@@ -40,8 +40,9 @@ class Range;
 class CORE_EXPORT FormatBlockCommand final : public ApplyBlockElementCommand {
  public:
   static FormatBlockCommand* create(Document& document,
+                                    CommandSource source,
                                     const QualifiedName& tagName) {
-    return new FormatBlockCommand(document, tagName);
+    return new FormatBlockCommand(document, source, tagName);
   }
 
   bool preservesTypingStyle() const override { return true; }
@@ -50,7 +51,7 @@ class CORE_EXPORT FormatBlockCommand final : public ApplyBlockElementCommand {
   bool didApply() const { return m_didApply; }
 
  private:
-  FormatBlockCommand(Document&, const QualifiedName& tagName);
+  FormatBlockCommand(Document&, CommandSource, const QualifiedName& tagName);
 
   void formatSelection(const VisiblePosition& startOfSelection,
                        const VisiblePosition& endOfSelection,